Re: //c clone?

["Roger Johnstone" <rojaws@mac.com>]

In article <3D2ED5F3.7030701@noneofyourbusiness.com>, Exegete 
<millers@noneofyourbusiness.com> wrote:

> Apple's RGB and IBM's RGB were both digital.

The Apple III and IBM's CGA use digital RGB, although the colour encoding
scheme is different. The Apple IIgs has analogue RGB. Other Apple IIs,
including the IIc, need a card to produce an RGB signal. These were
available in either digital or analogue versions.

> I've never heard of the "Video 7" box. Was that an Apple product? If
> not, then mentioning it is irrelevant.

It was a third-party add-on for the IIc video port to produce an RGB video
signal.

> However, part of my original post was in error. I was thinking of the
> Franklin 500, not the Laser 128. The Franklin manual says:
>
> RGB monitor manufacturers use different conventions for their RGB signal
> requirements. In general, there are two configurations for monitors, the
> Apple and the IBM. The main difference between the two types is that the
> Apple configuration uses a composite signal for the horizontal and
> vertical synchronization, and the IBM uses separate signals for them.
> The two types also use a different labeling system (called color
> palette) for colors. Some RGB monitors have a switch which permits
> selection of the Apple or IBM modes. If you have a choice, use the Apple
> mode.
>
> (BTW - the drawing on the preceding page, for connecting an RGB monitor
> shows a standard DB-9 connector, male plug, female port.)
>
> ... The palette assignments for colors is somewhat arbitrary and may not
> matter until you use some software that produces red grass and orange
> sky. The four-position RGB slide switch on the front panel should give
> white, green, amber, and blue text in its four settings. If these colors
> aren't accurate, the wrong color palette has been selected.
>
> Roy